Core for concrete walls.



PATENTED MAY- 14, 1907.

J-. H. LANDRY. GORE FOR OONGRETEJWALLS.

A'PPLIOLTION FILED APR. 6, 1907.

-' WITNESSES: 6. 4!. 414%..

} UNITED STATES PATENT OFFICE.

JOSEPH HENRY LANDRY, APPLETON, WISCONSIN.

CORE FOR CONCRETE WALLS.

' Specification of Letters Patent.

Patented May 14:, 1907.

Application filed April 6, 1907. Serial No. 366.704.

State of WVisconsin, have invented a new and I useful Improvement in Cores for Concrete Walls, of which the following is a specifica tion.

My invention relates to a collapsible core for use in the erection of the walls of a building of a plastic material, such as is usually called concrete, and is formed of water, cement, gravel, sand, and sometimes other mineral substances, the core being for forming hollow walls, and it consists of a box like structure, the plan of its top and bottom being a six sided figure, formed principally of wood, and may be of any size suited for its purpose, it having two side pieces and two longitudinally reciprocating center pieces, a lever for reciprocating the center pieces, and top and bottom plates, the top one having a slotted perforation through which its operating lever handle works, and both plates having slotted perforations along their lon gitudinal edges through which headed bolts or screws pass into the side pieces for holding the parts in position, and the object of the invention is to provide a core that is convenient to use, and can be so cheaply made that its cost will. be no hindrance to its general use, the device being shown in the accompanying drawing, in which, 7

Figure 1 is a top view of the core expanded to its full size as it is when used in a wall. Fig. 2 is a like view of it when it is contracted to its smallest dimension for being withdrawn from the Wall. Fig. 3 is a side elevation of the core lengthwise of it, one of the side pieces being removed and showing the two center pieces in heavy lines in their contracted form, and in dotted lines in their expanded form. Fig. 41 is a top view of the upper one of the center reciprocating pieces. Fig. 5 shows an edge view of the operating lever handle, with its fulcrum pin. Fig. 6 is a plan of a thin metallic plate through which. the handle passes.

Similar numerals indicate like parts in the several views.

1 and 2, indicate two similar side pieces having a smooth outer surface, beveled ends 3, and each one having upon the inside of each end a thickened end or projection 4, and thereby forming recesses 5. Both edges of the side pieces are provided with holes 6 for receiving fastening screws or bolts 7. Two plates, 8, which may be of thin sheet metal, are provided, one for the top and the other for the bottom of the core, each being provided with transversely slotted perforations 9, for receiving the fastening screws, which screws are not screwed quite down upon the plates, but are left loose so that the side pieces can move sidewisev These plates upon the top of the core in Fig. 1, are broken off at both ends, and at the left hand end in Fig. 2, for showing the form of the inside ends of the side pieces 1 and 2, and the position of the expanding device, when the core is in its contracted position. The center reciprocating pieces 10 and 11, are similar in form, of a width corresponding with the width of the side pieces, the outer end of each being beveled off to a point 12, and each being provided with a mortise 13 for the insertion of the operating handle lever, a pin 14, being driven tightly through the mortise in each piece for the engagement with it of said handle lever. This lever 15, is' provided with a pin 16, rigid with it, the ends of which enter bores in the side pieces, and in which bores the lever handle is fulcrumed. Above and below said pin are slots 17 for receiving the pins 14, the center pieces being broken away in Fig. 3 and showing said slots and pins.

Upon the upper edge of the center piece 1]., a thin piece of sheet metal 18, is fitted. to slide along in the rabbet 19, it being provided with a slot 20, through which the lever 15 passes, said thin piece sliding back and forth along the rabbet -1 9 and serving to prevent the dropping of the plastic being used in forming the Wall, into the mortise 13, the position of the mortises being shown by the vertical dotted lines 21 across said pieces in Fig. 3.

The cores are used as follows: A sullicient number of cores having the required length and width being provided for the wall to be built, they are to be placed in their expanded form, as in F ig. 1, upon the foundation, or at such a height upon the wall as it is desired that the hollow walls connnei'ice, and between. the boards betwcmi which the concrete is to be placed l'or l'ornnng the wall.

1 Concrete ol' the proper consistency is then 'lilled in between said inclosiug boards and. around the cores until their tops are nearly reached. This concrete is then allowed to dry until the concrete has set, when the cores are to be contracted by tl'irowing the handle 15 over to the left, as shown in Fig. 2 and in heavy lines in Fig. 3, and thereby drawing the center pieces 10 and 11 backward and allowing the side pieces 1. and 2 to be moved inward the distance of the difference between the thickness of the outer ends of the center pieces 10 and 11 and the spaces between the extreme ends of the side pieces 1 and 2 when they are in their contracted position, as in Fig. 2. This moving inward of the side pieces after the center pieces have been drawn inward as in Fig. 2 can be done by shaking the core sidewise by means of its handle, or if the core sides should require a more positive force for their loosening from the concrete, a thin wedge can be driven in between the core sides and the concrete. The outer ends of the side pieces being cut on a bevel as shown, upon the moving inward of the side pieces, their ends recede from the concrete which has been packed in around them and has set, so that a space is left entirely around the six sides of the core, and it can be lifted and placed in position for another course in the height of the wall. After the cores are loosened, they are to be lifted by their handles to the top of the wall as formed, the outerinclosing bo ards raised correspondingly, and the work proceeded with. It Will be evident that these cores can be formed entirely of metal, but for making them of light arranged parallel with each other and having their expanded position forming a continuabeveled ends, straight outer sides and the principal portion of their inner sides also straight but being provided with thickened ends, a plate of thin material having transversely arranged slots near its longitudinal side ed es, secured loosely with belts or screws t irough said slots to the top and bot tom edges of each side piece for holding them spaced apart, two center pieces correspond.

ing in width with said side pieces arranged for a reciprocating movement longitudinally, between said side pieces, their ends when in tion of the beveled ends of the side pieces and terminating in a blunt point centrally there- (ii, a lever handle i'ulcrunied in the two side pieces and engaging the center pieces for throwing the ends 01' the center pieces outward, and also, retracting the same so that their outer ends are inside ol' the thickened ends of said side pieces for allowing the two side pieces to move toward each other, and thereby to contract the area of said. core upon six sides of it, substantially as described.

2. A collapsible core for the purpose dcscrihed, consisting of two similar sidepieccs arranged parallel with each other and having beveled ends, straight outer sides and the principal portion of their innersidcs also straight but being provided with thickened ends, a plate of thin material l'iaving trans' versely arranged slots near its longitudinal side edges secured loosely with belts or screws through said slots to the top and bottom edges of each side piece for holding them spaced apart, two center pieces corresponding in width. with said side pieces arranged lor a reciprocating movement longitudinally, between said side pieces, their ends when in their expanded position forming a continuation of the beveled ends of the side pieces and terminating in a blunt point centrally tl'iereoif', a lever handle fulcrumed in the two side pieces and engaging the center pieces for throwing the ends of the center pieces outward, and also, retracting the same so that their outer ends are inside of the thickened ends of said side pieces for allowing the two side pieces to move toward each other, and thereby to contract the area of said core upon siX sides of it, and a thin plate fitting around said handle and being arranged to slide with it as the handle is oscillater], for preventing the admission around athe handle and under the upper thin side securing plate of plastic, or other material, substantially as set forth.

3. A collapsible core for the purpose described, consisting of two similar side pieces arranged parallel with each other and spaced apart, having greater inside than outside longitudinal dimensions, the ends of the side pieces having a straight bevel from the outer to the inner side thereof, a recess having an outward flare at each end extending from near one end to near the other along the inside of each side piece, a plate of thin material having transversely arranged slots near its longitudinal side edges, secured loosely with belts or screws through said slots to the top and bottom side edges of each side piece, for holding them apart, two center pieces corresponding in width with. said side pieces, arranged between them, one at each end, for a reciprocating movement longitudinally thereof, the outer end of each. when in its ex panded position forming a continuation of the bevel of the end of each side piece and terminating in a blunt point at their transverse eenter, a lever handle fulcrumed in the two side pieces and engaging a pin in each center piece for throwing the beveled ends of the center pieces outward flush with the bevel upon the ends of the side pieces, and inward beyond the aforesaid flare of the recess of each side piece for allowing the two side pieces to move inward, and thereby contract the area IQ of said core upon six sides of it, substantially as set forth.

JOSEPH HENRY LANDRY. WVitnesses WM. BREWER,

C. M. ALBEE. 

